Rock machine-drill for operating with flushing-water.



-R. MEYER ROCK MACHINE DRILL FOR OPERATING WITH FLUSHING WATER.

APPLICATION FILED JUNE 5, 1912.

R 1 4 6 Patented Apr. 3, 1917.

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Known rock machine-drills operating by percussion and with flushingwater, in which I drills the flushing Water is introduced into the borethrough the hollow drill either alone or with the aid of the compressedair operating the piston, have fundamental disadvantages. Inthemaohine-drills into whose bores the flushing water is introduced underpressure, from the rear or from the side of the '25 through the drilland its outlet by. means of compressed air. In known machines of. thiskind which flush with the aid of the coinpressed air already in thecylinder the pressure operating the drill is so variable that theflushing is not always satisfactory and a leakage of the flushing waterinto the machine cannot with certainty be avoided.

A primary object of my invention is to ob-v viate these defects, andconsequently arrange that a pressure, which operates continuously isproduced behind the drill by means of compressed air which is introducedindependently of that required for the piston; so that the flushingwater is always driven at the required velocity through the drill and aleakage of the same into the machine is avoided. The compressed air thusaiding the flushing water is preferably introduced irour'the' rear endof the machinemnd by means of a pipe concentric with/{the flushing waterpipe and kept airtight tlici'ctrom. The bore of the piston can be madeof such a size that the compressed air aiding the flushing water, in theevent of a larger pressure injurious to the action oi" the machinearising, ran insin po through the piston and pass out through an.exhaust port.

Specification of Letters Yetent.

appliance, the parts wheroat the water enters Patentedflpr. 3, $911.?

lhe air supply for the oscillation of the piston can consequently bekept quite independent"throughout by providing the pis ton, as isalready known in steam engines, with a rear piston rod, which goesthrough the cylinder cover and is made suitably airtight thereat. j i

The compressed air-flowing in the direc tion oftlie stream of watergives, owing to its kinetic energy, an eiiectual impulse to the flushingwater in the direction of the pipe. In order to prevent a. leakage ofthe flushing water into the machine the pipe oonreymg the former to thebore in the drill extends beyond the air pipe. There then obtains in thespace nto which both pipes PLOJGCi a zone, beh1nd the place where thewater issues, which continually remains under air pressure and whichprevents a leakage of the flushing water into the ma chine. The ends ofthe pipes can be formed like nozzles in order to accentuate the ac tionin the direction of the drill.

'lwo illustrative embodiments of my iii-- vention are represented. byway of example in the accompanying drawing wherein:

Figure lis a longitudinal section of the machine portion of the firstform of flushing device, which in no way aiticcts the distribution ofthe compressed air used in the interior of the machine or "forms aconnec cylinder. and

Fig. 2 is a similar longitudinal section of i the second form, in whichthe double feed pipes are used in a percussion machine-drill of normalconstruction.

Referrin to the first form shown in Fig. 1 the piston]; which is movedto and fro in the working cylinder (4 by the driving agent, for examplecompressed air, is provided in known manner with a piston-rod c, whichgives the percussion blows to the projecting end a on the drill. Theother side of the piston is provided with a rod d which passes throughthe cylinder cover f and is rendered air-tight thercat. The cover f hasa cylindrical projection a into whose end It two pipes i, k, the onefitting into the other with tight at their bearing places so that therecan be no connection between the chambers A, B, O. The piston isprovided with a bore Z, throughout its length, which bore is of such asize that the pipe is passing through this bore does not come intocontact with the, same. The front ends of the pipes L, 5 fit with playinto the bore m of a drill arranged in known manner in the machine. Theinner pipe 71 preferably extends somewhat beyond the pipe is. Theremainder of the machine is so arranged that the inwardly projecting end6 of the drill when returning toward the interior of the machine cannotcome into contact with the ends of the pipes 2', 7c. In drills having asmall bore the introduetion of these pipes is facilitated by wideningout the entrance to the bore as shown in Fig. 1 The flushing deviceoperates in the followingvmanner. The pressure Water is introduced intothe chamber B and flows through the inner-pipe a into the bore m of thedrill. The agent, e. 9., compressed air, for operating on the flushingwater, is introduced into the chamber A preferably with an undiminishedpressure and in an uninterrupted stream. The said agent then passes,through that annular portion of the outer pipe is which surrounds thepipe 2', directly into the bore m of the drill. As the pressure energyof the agent is partly converted into velocity energy when the saidagent leaves the pipe, the flushing water issuing from the pipe 2' isejected with greater force through the bore of the drill. Moreover, asthe pressure agent issues at a point behind the point of issue of theflushing watergthere is continually formed a zone of compressed air ofuniform pressure and of considerable jetaction, which zone closestherear opening into the bore m, and which, standing as a barrier to thejet of water, thus effectively prevents a leakage of the same into thein terior of the machine. The flushing device iskept completelyindependent of the operation of the pressure means within the machineproper, owing to the piston-rod (Z passing air-tight through the coverMoreover,

owing to the bore in the piston opening into the chamber 0 provided withthe outlet a, there cannot occur in the chamber D a counter pressure inany way affecting the opera tion of the. machine.

Air under pressure always exists in the space D by reason of the zone ofcompressed air which closes the rear opening of the bore m.

The second form of flushing device illustrated in Fig. :2 hastheadvantage of shorter length owing to the piston-rod a? beingexcluded; In order in every case to obtain a suliicient'jet adtion-ofthe flushing mixture in the'bore of'the drill it is possible,,oving tothe c'ornpressedair and water being separately introduced, to obtain inthe bore of the drill an exact regulation both of pressure and oftheadmitted quantities of compressed air and water before these enter thepipes Z and 7c,

1. A percussion machine drill, comprising a casing, a hollow drill atone end of the same, a piston guided longitudinally in the casing to andfrom the drill, a water supply pipe terminating within the drill, meansfor supplying water to said water supply pipe 7r at a pressure less thanthe flushing pressure, and a supply pipe for compressed air terminatingwithin the drill, the said terminal of the said compressed air pipebeing intermediate the terminal of the water supply 30 pipe and thepiston, the said compressed air driving said water into said drill atthe flushing pressure.

A percussion machine-drill, comprising a. casing, a hollow drill at oneend of the same, a hollow piston guided longitudinally in the casing toand from the drill, a water supply pipe extending axially through the,piston and terminating within. the drill, and a compressed air pipelikewise extending axially through said piston and terminating in saidspace, the water pipe being co-axial with and arranged within the airpipe, said water pipe being connected at its rear end with the casingand said air pipe being connected at its rear end with the casing airtight from said water pipe.

3. A percussion machine-drill, comprising a hollow casing, a hollowdrill at one end of the same, a cover at the other end, means f fordelivering a continuous stream of water under pressure in drillingdirection at the longitudinal axis of the machine, a piston guidedlongitudinally in the casing to and from the drill, and having at itsrear end a piston rod guided air tight in said cover, said waterdelivering means terminating within the drill, and means for deliveringa continuous stream of compressed air in the same space in drillingdirection at the longi tudinal axis of the machine.

a. A percussion machine-drill conugrisin a hollow casing, a. hollowdrill at one end of the same, a piston guided longitudinally in thecasing to and from the drill, a water supply pipe extending axiallythrough the piston and terminating within the drill, and a compressedair pipe likewise extending axially through said piston and terminatingin said space, said piston having a bore of larger diameter than saidpipes therein, and said casing having behind the piston an outlet.communicating with said bore.

5. A percussion machine drill, comprising af casing, a hollow drill atonenend of 1 5 the same, a piston guided longitudinally in the casing toand from the drill, a water supply pipe terminating within the drill,and a supply pipe for compressed air ter minating within the drill andconnected to said casing away from the terminal of said. as myinvention, 1 have signed my name in Water supply pipe, and a connectingpipe presence of two subscribing Witnesses.

between the terminal of the said compressed ROBERT MEYER. [10. SJ

air supply pipe and the space between the Witnesses:

' 5 said drill and the said piston. HELEN NUFER,

In testimony, that I claim the foregoing ALBERT News.

